Advantages of LSX block for twin turbo application?

[broken1234]

I'm in the planning stage for a twin turbo 8/900 hp 70 Camaro project.

Being new to forced induction, I'm curious about folk's thoughts and suggestions on just how strong I need to build the bottom end for this HP set-up.

It has been suggested that an LSX block with additional head studs, and an appropriate set of heads, would be a worthwhile investment.

Can someone comment on their experience here and suggest some parts combos that will get me where I want to go without overkil or breaking the bank?

Thanks,

Brad

[ironworks]

There is no such thing as a 900hp twin turbo budget engine that will last.

The LSX block is awesome, it is heavy but super strong. GM says it can handle 2500 hp. A billet LS block will do the same for about triple the cost.

As far as that the engine will be expensive to make it last, unless it's a one hit 900hp wonder.

[Rybar]

Brad a good buddy of mine is building a 427 LSX and he's putting twin T76 turbo's on it. This is for a Drag Car but I believe he's going with 6 bolt heads/studs and fully forged internals. Brand names I'm not sure.

[badmatt]

A stock studded 6.0L iron block will take that no question.

[broken1234]

Well, the clearer story is this; I want about 700 hp at the rear wheels. I'm told that I'll lose about 15% in the driveline (T56 and a Ford 9"). I will have access to an engine dyno.

It's been suggested that my biggest concern is internal pressures, thus the LSX block and it's extra head stud. Obviously all forged stuff in the bottom end. Is this valid?

What else am I missing here?

I don't expect to regularly run the engine at high boost levels. This car won't be a regular racer or autocrosser, just a street car that occasionally hits the track...

[camcojb]

I've seen many 700 rwhp+ LS engines with the stock aluminum or iron blocks. The LSX block is a great platform, but not required. Where it comes into play is if you'll be running high boost, like 20 psi+. If it takes that much boost with your combo to make 700 rwhp, change your combo............

Easy to make big power with a forced induction LS engine. The TT 402 in my last car made well over that with a 4L80E and 9", and the boost level was at 14 psi. At that boost level you do not need the extra head bolts. Never got a full pull due to it shutting the dyno down around 4800 rpm due to excessive torque, but I'm confident in saying it was over 700 rwhp.